proksi 0.1.10

A batteries-included reverse proxy with automatic HTTPS using Cloudflare Pingora and Let's Encrypt.
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use std::{net::ToSocketAddrs, sync::Arc, time::Duration};

use async_trait::async_trait;

use pingora::{
    server::{ListenFds, ShutdownWatch},
    services::Service,
};
use pingora_load_balancing::{health_check::TcpHealthCheck, selection::RoundRobin, LoadBalancer};
use tokio::sync::broadcast::Sender;
use tracing::debug;

use crate::{config::Config, MsgProxy, ROUTE_STORE};

// Service discovery for load balancers
pub struct RoutingService {
    config: Arc<Config>,
    broadcast: Sender<MsgProxy>,
}

impl RoutingService {
    pub fn new(config: Arc<Config>, broadcast: Sender<MsgProxy>) -> Self {
        Self { config, broadcast }
    }

    /// From a given configuration file, create the static load balancing configuration
    fn add_routes_from_config(&mut self) {
        for route in &self.config.routes {
            // For each upstream, create a backend
            let upstream_backends = route
                .upstreams
                .iter()
                .map(|upstr| format!("{}:{}", upstr.ip, upstr.port));

            add_route_to_router(&route.host, upstream_backends);

            debug!("Added route: {}, {:?}", route.host, route.upstreams);
        }
    }

    /// Watch for new routes being added and update the Router Store
    fn watch_for_route_changes(&self) -> tokio::task::JoinHandle<()> {
        let mut receiver = self.broadcast.subscribe();

        tokio::spawn(async move {
            loop {
                if let Ok(MsgProxy::NewRoute(route)) = receiver.recv().await {
                    add_route_to_router(&route.host, route.upstreams);
                }
            }
        })
    }
}

#[async_trait]
impl Service for RoutingService {
    async fn start_service(&mut self, _fds: Option<ListenFds>, _shutdown: ShutdownWatch) {
        // Setup initial routes from config file
        self.add_routes_from_config();

        // Watch for new hosts being added and configure them accordingly
        tokio::select! {
            _ = self.watch_for_route_changes() => {}
        };
    }

    fn name(&self) -> &str {
        "proxy_service_discovery"
    }

    fn threads(&self) -> Option<usize> {
        Some(1)
    }
}

// TODO: find if host already exists but new/old upstreams have changed
fn add_route_to_router<A, T>(host: &str, upstreams: T)
where
    T: IntoIterator<Item = A>,
    A: ToSocketAddrs,
{
    let mut upstreams = LoadBalancer::<RoundRobin>::try_from_iter(upstreams).unwrap();

    // TODO: support defining health checks in the configuration file
    let tcp_health_check = TcpHealthCheck::new();
    upstreams.set_health_check(tcp_health_check);
    upstreams.health_check_frequency = Some(Duration::from_secs(15));

    ROUTE_STORE.insert(host.to_string(), Arc::new(upstreams));
}